Enum clap_builder::builder::Resettable
source · pub enum Resettable<T> {
Value(T),
Reset,
}
Expand description
Clearable builder value
This allows a builder function to both accept any value that can Into::into
T
(like
&str
into OsStr
) as well as None
to reset it to the default. This is needed to
workaround a limitation where you can’t have a function argument that is impl Into<Option<T>>
where T
is impl Into<S>
accept None
as its type is ambiguous.
Example
fn common() -> Command {
Command::new("cli")
.arg(Arg::new("input").short('i').long("input"))
}
let mut command = common();
command.mut_arg("input", |arg| arg.short(None));
Variants§
Trait Implementations§
source§impl<T: Clone> Clone for Resettable<T>
impl<T: Clone> Clone for Resettable<T>
source§fn clone(&self) -> Resettable<T>
fn clone(&self) -> Resettable<T>
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl<T: Debug> Debug for Resettable<T>
impl<T: Debug> Debug for Resettable<T>
source§impl<T> From<Option<T>> for Resettable<T>
impl<T> From<Option<T>> for Resettable<T>
source§impl<T> From<T> for Resettable<T>
impl<T> From<T> for Resettable<T>
source§impl<T: Hash> Hash for Resettable<T>
impl<T: Hash> Hash for Resettable<T>
source§impl<T> IntoResettable<T> for Resettable<T>
impl<T> IntoResettable<T> for Resettable<T>
source§fn into_resettable(self) -> Resettable<T>
fn into_resettable(self) -> Resettable<T>
Convert to the intended resettable type
source§impl<T: Ord> Ord for Resettable<T>
impl<T: Ord> Ord for Resettable<T>
source§fn cmp(&self, other: &Resettable<T>) -> Ordering
fn cmp(&self, other: &Resettable<T>) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
source§impl<T: PartialEq> PartialEq for Resettable<T>
impl<T: PartialEq> PartialEq for Resettable<T>
source§fn eq(&self, other: &Resettable<T>) -> bool
fn eq(&self, other: &Resettable<T>) -> bool
This method tests for
self
and other
values to be equal, and is used
by ==
.source§impl<T: PartialOrd> PartialOrd for Resettable<T>
impl<T: PartialOrd> PartialOrd for Resettable<T>
source§fn partial_cmp(&self, other: &Resettable<T>) -> Option<Ordering>
fn partial_cmp(&self, other: &Resettable<T>) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moreimpl<T: Copy> Copy for Resettable<T>
impl<T: Eq> Eq for Resettable<T>
impl<T> StructuralEq for Resettable<T>
impl<T> StructuralPartialEq for Resettable<T>
Auto Trait Implementations§
impl<T> RefUnwindSafe for Resettable<T>where
T: RefUnwindSafe,
impl<T> Send for Resettable<T>where
T: Send,
impl<T> Sync for Resettable<T>where
T: Sync,
impl<T> Unpin for Resettable<T>where
T: Unpin,
impl<T> UnwindSafe for Resettable<T>where
T: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more